A.in high latitudes
B.near the equator
C.on north or south headings
D.on intercardinal headings
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A.induced magnetism in the vessel's horizontal soft iron
B.change in the magnetic field when the vessel inclines from vertical
C.permanent magnetism of the vessel
D.magnetic fields caused by electrical currents in the vicinity
A.the vessel's heading
B.sea conditions
C.seasons
D.the vessel's position
A.compass error
B.true heading
C.variation
D.deviation
A.geographic pole and the magnetic pole
B.lubber's line and true north
C.horizontal and the magnetic line of force
D.compass heading and the magnetic heading
A.varies depending upon the bearing used
B.is the angular difference between magnetic north and compass north
C.is published on the compass rose on most nautical charts
D.is the angular difference between geographic and magnetic meridians
最新試題
Which compensates for errors introduced when the vessel heels over（）.
What is the name of the movable，radial guide line used to measure direction on a radar?（）
Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west（）.
The most accurate method of determining gyrocompass error while underway is by（）.
The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interval（）.
What is an advantage of the magnetic compass aboard vessels?（）
What is the basic principle of the magnetic compass?（）
What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.
Which statement about the gyrocompass is FALSE（）.